See this link: https://en.wikipedia.org/wiki/Attenuated_vaccine#Advantages https://en.wikipedia.org/wiki/Attenuated_vaccine#Advantages Advantages of an attenua

See this link: https://en.wikipedia.org/wiki/Attenuated_vaccine#Advantages https://en.wikipedia.org/wiki/Attenuated_vaccine#Advantages Advantages of an attenuated vaccine: - Activates all phases of the immune system - Provides more durable immunity; boosters are required less frequently [other are mainly logistics] The disadvantage is that it may cause a reversion to virulence in 3 per 1 000 000 doses given. And it cannot be used in immunocompromised individuals.